Hello! How can i generate lambda function at comiler ir phase? I'm transforming function body and w...

# compiler

[PHondogo]

Hello!
How can i generate lambda function at comiler ir phase?
I'm transforming function body and want to assign lambda to variable. That lambda must be my generated lambda.
I found IrFunctionImpl class that i can use for that, but it has parameter of FunctionDescriptor. But to create it, i need to specify containing declaration, but in M3 links to frontend structures were removed or deprecated.

[Roman Artemev [JB]]

First, general way to create a lambda function is to use IrFunctionExpression .
As descriptor you could use WrappedSimpleFunctionDescriptor or even build IrSimpleFunction with IrFunctionBuilder

[PHondogo]

@Roman Artemev [JB] Thanks for reply! I see that in IrModuleFragment property descriptor is not deprecated. Will it be?

[PHondogo]

One more question: pluginContext.referenceClass("kotlin.UnsupportedOperationException") returns null. Is this method search only in current module symbols? If so how can I reference class from dependency module?

[Roman Artemev [JB]]

You are doing everything right. Looks looks a bug

[Roman Artemev [JB]]

pluginContext.referenceClass searches among module dependencies too. Actually it is a recommended way to access external symbols.
Could you please find an issue in YT with it?

[PHondogo]

I can't find one. I guess it is related to typealias. Cause kotlin.IllegalStateException is a typealias for jvm to java.lang.IllegalStateException. Does typealias resolves on pluginContext.referenceClass? I can't find method where typealias mentions.

[Roman Artemev [JB]]

Ohh, yeah. It seems to be. Is that JVM platform?

[Roman Artemev [JB]]

No, it’s not right now. Please file an issue-request. Will try to support soon.
BTW, does pluginContext.referenceClass("java.lang.UnsupportedOperationException") work for you?

[PHondogo]

I reproduced with class in the same module but typealiased. Use IR -> JVM

[Roman Artemev [JB]]

Yeah, it is lack of implementation in our API. We’re going to fix it soon.

[PHondogo]

https://youtrack.jetbrains.com/issue/KT-40193